To prepare for plenty of deposit and withdraw actions that will during the game,we write a script for it,we need to do some testing to know that if our server could afford it and if our nodes are enough or not,the more important thing is that we need to avoid whether there will be some serious and irreversible problems,hence we send notification to all the exchanges by e-mail,advise them temporary frozen the deposit&withdraw of GML.
  We will try our best to solve this problem ASAP,please give us a little times.

Thanks!